{"product_id":"ignition-coil-and-iridium-spark-plugs-for-volvo-s40-2004-2012-2-5l","title":"Ignition Coil and Iridium Spark Plugs for Volvo S40 (2004-2012) 2.5L","description":"\u003ch2\u003eDirect-Fit Ignition Coil and Iridium Spark Plug Kit for 2004-2012 Volvo S40\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eComplete Secondary Ignition Refresh:\u003c\/strong\u003e Restores factory ignition energy, stabilizes combustion dynamics, and eliminates load-induced cylinder misfires on 5-cylinder Volvo powertrains.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock S40 Ignition Degradation\u003c\/h3\u003e\n\u003cp\u003eCoil-on-plug packs on the Volvo P1 platform sit deep within the cylinder head recess beneath the engine cover, trapping excessive heat. Sustained thermal cycling causes micro-cracking in the factory epoxy potting and breaks down the secondary copper winding insulation, leading to dielectric punch-through and spark energy dissipation under boost. Concurrently, factory spark plug gap expansion increases resistance, placing elevated load on aged coils and causing rough idles, hesitation, and check engine lights (CEL).\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis ignition kit pairs five heavy-duty ignition coils with fine-wire iridium core spark plugs. The coil assemblies feature high-grade magnetic copper windings and reinforced dielectric silicone boots designed to withstand high thermal loads and prevent high-voltage arcing. Matched with corrosion-resistant iridium electrodes that minimize quenching and lower firing voltage demands, this kit delivers consistent spark propagation, improved combustion efficiency, and immediate throttle recovery.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2004-2012 Volvo S40\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eEngine \/ Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eB5254 2.5L I5 \/ P1 Chassis\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eStock Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e218-227 hp \/ 236 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eUF517, 30713417, 307134170, E1017, GN10331, 178-8383\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2004-2012 Volvo S40 2.5L 5-Cylinder Turbo \/ Non-Turbo (T5, T5 R-Design, AWD, FWD)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Volvo Precision Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to match OEM primary and secondary electrical resistance parameters, ensuring seamless integration with the factory ME9 engine management system without false misfire diagnostics or persistent CEL warnings.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50448856940792,"sku":"DS-E4J23IWVE","price":107.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-and-iridium-spark-plugs-for-volvo-s40-2004-2012-2-5l-1.jpg?v=1788661970","url":"https:\/\/performancechiptuning.com\/fr\/products\/ignition-coil-and-iridium-spark-plugs-for-volvo-s40-2004-2012-2-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}